Carburetor



Sept. 21, 1965 M. F. STERNER ETAL 3,207,490

CARBURETOR Filed March l5, 1962 4 Sheets-Sheet 1 sept. 21, 196s M. F. STERNER ETA.. 3,207,490

GARBURETOR 4Sheets-Sheet 2 Filed March 15, 1962 NNN Sept. 21, 1965 M. F. STERNER ETAL 3,207,490

CARBURETOR Filed March 15, 1962 4 Sheets-Sheet 3 SePt- 21, 1965 M. F. STERNER ETAL 3,207,490

CARBURETOR 4 Sheets-Sheet 4 Filed March 15, 1962 United States Patent O 3,207,490 CARBURETGR Melvin F. Sterner, Bloomfield Hills, Neil M. Romeo, St. Clair Shores, Frederick J. Marsee, Hazel Park, Mich., and William E. Egerer, deceased, late of Detroit, Mich., by Donald F. Egerer, executor, Warren, Mich., assignors to Holley Carburetor Company, Warren, Mich., a corporation of Michigan Filed Mar. 15, 1962, Ser. No. 180,049 2 Claims. (Cl. 261-34) The invention relates to carburetors and refers more specifically to a carburetor for use in conjunction with an internal combustion engine or similar device including a separate metering spacer positioned between a throttle body and a fuel bowl member and an air horn and fuel bowl cover member which metering yspacer includes a metering unit suspended lin the fuel bowl portion of the throttle body and fuel bowl member.

In prior carburetors wherein the mlain fuel wells are integral with a throttle body and fuel bowl member percolation effects on the operation of the carburetors due to heating of the throttle body and fuel bowl member has been a particular problem. Further in prior carburetors wherein the main fuel wells lare not located centrally of the carburetor fuel bowl with the metering jets positioned adjacent the bottom of the fuel bowl, system fuel wash-out in turns has often occurred. Similarly carburetors having carburetor accelerator pumps not positioned centrally of and at the bottom of the carburetor fuel bowl a-re subject to pump dry-out and produce acceleration failure in turns.

It is therefore one of the objects of the present invention to provide a carburetor including means for minimizing percolation effects.

Another object is to provide a carburetor including a fuel metering spacer positioned between a throttle body and fuel bowl member and an air horn and fuel bowl cover member including a metering unit suspended in the fuel bowl portion of the throttle body and fuel bowl member.

Another object is to provide a carburetor as set forth above wherein the metering unit of the metering spacer includes integral main and idle fuel wells tand metering jets, and an accelerating pump and power valve having fuel intake means adjacent the bottom thereof all of which are positioned centrally of the fuel bowl.

Another object is to provide a carburetor as set forth above which is simple in construction, economical to manufacture and efficient in use.

Other objects and features of the invention will become apparent as the description proceeds, especially when taken in conjunction with the accompanying drawings, illustrating a preferred embodiment of the invention, wherein:

FIGURE 1 is a top view of a carburetor constructed in accordance with the invention.

FIGURE 2 is an elevation of the carburetor illustrated in FIGURE l taken in the direction of arrow 2 in FIG- URE l.

FIGURE 3 is a section view of the carburetor .illustrated in FIGURE l taken on the line 3 3 in FIG- URE l.

FIGURE 4 is an exploded elevation view of the carburetor illustrated in FIGURE ll showing the air horn and fuel bowl cover, metering spacer, throttle body and fuel bowl member and the intermediate gaskets therefor separately.

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FIGURE 5 is a top view of the metering spacer taken in the direction 5 5 in FIGURE 4.

FIGURE 6 is a bottom view of the metering spacer taken in the direction 6 6 in FIGURE 4.

FIGURE 7 is a top view of the throttle body and fuel bowl member taken in the direction of arrows 7 7 in FIGURE 4.

FIGURE 8 is a partial section of the metering spacer taken on the line 8 8 in FIGURE 5.

FIGURE 9 `is a partial section of the metering spacer taken on the line 9 9 in FIGURE 5.

FIGURE l0 is a partial section of the throttle body and fuel bowl member taken in the direction of arrows 10--10 in FIGURE 7.

FIGURE ll is a partial section of the metering spacer taken on the line 11-11 in FIGURE 5.

FIGURE 12 is a partial section of the air horn and fuel bowl cover taken in the direction of arrows 12 12 in FIGURE l.

FIGURE 13 is a partial section of the metering spacer taken in the direction of arrows 13 13 in FIGURE 5.

With particular reference to the figures of the drawings one embodiment of the present invention will now be disclosed.

The carburetor 10 in accordance with the invention comprises the metering spacer 12 sandwiched between the air horn and fuel bowl cover member 14 and the throttle body and fuel bowl member 16. As shown best in FIGURE 4 the air horn and fuel bowl cover 14 and metering spacer 12 and the metering spacer 12 and the throttle body and fuel bowl 16 are separated by gaskets 18 and 20 in assembly.

In addition the metering spacer 12 is provided with the metering unit 22 which `is constructed integral with the metering spacer in a position to be located within the fuel bowl of the throttle body and fuel bowl 16 with the carburetor in assembly. With the metering unit 22 so located the percolation effects on the operation of the carburetor due to heating of the throttle body and fuel bowl 16 is substantially eliminated. Also, system fuel washout in turns and acceleration failures in turns are substantially eliminated by central positioning of the metering spacer 22 at the bottom of the fuel bowl 24 as will become more evident subsequently.

More specifically the throttle body and fuel bowl 16 as shown best in FIGURES 4 and 7 is an integral casting including a fuel bowl portion 24 and having a pair `of main venturi passages 26 extending therethrough. The throttle valve 30 is rotatably mounted at the bottom of the venturi passages 26 as shown best in FIGURE 10.

The throttle actuating linkages 32 which may be 0perated for example by the usual accelerator pedal (not shown) are secured to the throttle body and fuel bowl 16 as shown. The throttle linkage 32 in addition to positively operating the throttle valve 30 includes portions 34 and 36 operable to simultaneously actuate the accelerator pump 38 and the choke valve 40.

The throttle body and fuel bowl 16 further includes the vacuum passage 42 therein operable in conjunction with the piston 44 to provide automatic vacuum choke operation through linkage 46. Opening 54 is provided to permit passage of choke linkage 56 therethrough. In addition passage 48 is provided through the throttle body and fuel bowl 16 to provide a vacuum connection for the piston 126 of the carburetor power valve 80. The mounting flange 50 having openings S2 therethrough through which mounting bolts extend is provided on the throttle body and fuel bowl 16 to permit mounting of the throttle body and fuel bowl on the device with which the carburetor 1s used.

Metering spacer 12, as shown best in FIGURES 4-6, is`

connection of fuel lines thereto from a plurality of directions. Also, it will be noted that the fuel float mounting means 64 is integral to provide bearing surfaces for the pin 66 pivotally mounting the lever arm 68 of the fuel bowl float 70.

The metering spacer 12 further includes the metering unit 22 previously indicated which houses the main fuel wells 72 and metering jets 74 therefor and the idle fuel wells 76 shown best in FIGURE 9. The accelerating pump cylinder 78 and power valve seat 110 are also provided as an integral part of the metering unit 22.

For a detailed consideration of the operation of the fuel wells 72 and the booster venturis 58 reference is made to the commonly owned United States Patents No. 3,081,986 and No. 3,110,750. Detailed consideration of the operation of the power valve system 80 is set forth in commonly owned United States patent application Serial No. 92,732, led February 27, 1961. Operation of the accelerating pump 38 is explained in detail in commonly owned United States Patent No. 3,110,749.

The air horn and fuel bowl cover member 14 as best shown in FIGURE 4 includes the air induction passage 82 in which the choke Valve 40 is pivotally mounted. Air horn and fuel bowl cover 14 further lsupports the piston 86 and actuating means 88 of the accelerating pump 38 and the internal and external fuel bowl vent valves 89 and 90, as shown best in FIGURES 12 and 3 respectively. An air cleaner mounting stud 92 is provided on the air horn and fuel bowl cover 14 mounted on bracket 94 at the side of the air induction passage 82 as shown best in FIGURE 4.

The particular fuel bowl external air vent valve 90 is considered in detail in comm-only owned United States Patent No. 3,110,749. The specific choke valve 84 and bearing support means 96 therefor is considered in more detail in commonly owned United States patent application Serial No. 100,114, led April 3, 1961, while the air cleaner mounting bracket 94 and studs 98 and arcuate surfaces 100 which provide for mounting air cleaners having mounting rings of different -size on carburetor are considered in the commonly owned United States patent applications Serial No. 100,139, led April 3, 1961 and Serial No. 93,791, filed March 6, 1961, respectively.

In assembly as shown best in FIGURE 3, the metering spacer 12 is positioned on the throttle body and fuel bowl member 16 with the gasket 20 therebetween. The studs 102 on the metering :spacer 12 cooperate with the mating openings 104 in the throttle body and fuel bowl to Valign the mating spacer 12 on the throttle body and fuel bowl 16. Similarly the air horn and fuel bowl cover 14 is aligned on the metering spacer 12 by means of studs 106 on the metering spacer 12 and corresponding mating openings 107 in the bottom of the air horn and fuel bowl cover 14 with the gasket 18 therebetween.

Thus, as shown in FIGURE 3, the metering unit 22 is positioned centrally of the fuel bowl 24 with the metering jets 74 of the fuel wells and fuel inlet valves 108 and 110 of the accelerating Valve and power valve respectively adjacent the bottom thereof. Thus with the air horn and fuel bowl cover 14, metering spacer 12 and throttle body and fuel bowl 16 in assembly, as shown in FIG- URE 3, the main fuel wells 72 are surrounded by fuel and are insulated from the heat of the throttle body and fuel bowl member 16 which is connected directly to the engine by the surrounding fuel and gasket so that percolation effects on the operation of the carburetor 10 are minimized.

Further the fuel inlet pas-sages to the fuel wells, accelerating pump, and power valve are positioned centrally of the fuel bowl, at the bottom thereof whereby removal of fuel from the inlets due to piling up of the fuel at one side or the other of the carburetor fuel bowl during turns is substantially eliminated. Thus maximum use of fuel within the fuel bowl cavity is possible and yacceleration failures in turns are substantially eliminated.

In over-all `operation of the carburetor 10 it will be understood that fuel is fed to the carburetor through the fuel fitting 62 from a' fuel pump and fuel source (not shown) in response to the position of the two-part fuel float 70 as determined by the level of fuel in the fuel bowl 24. At idle speeds the engine receives an idle fuel supply through the metering jet 74, main fuel well 72, auxiliary fuel well 76 and across the metering orifice 112 in the metering spacer 12. The fuel is then mixed with air from the idle air bleed 115 in `air horn 14 after which it passes through the passages 114 in the throttle body and fuel bowl member 16 to a point below the throttle valve 30. The external vent valve 90 may be adjusted to be opened by lever 132 through linkage portion 34 at idle speed.

At speeds above engine idle speed the fuel is delivered from the fuel bowl 24 through the metering jet 74 to the main fuel well 72 where it is mixed with air from the flared main well tubes 116 land delivered through passages 118 and 120, shown in FIGURE 10, into the main venturis 26 through the booster venturis 58. When additional fuel is called for due to engine power requirements the power valve system is actuated by a decreased vacuum in passage 122 through recess 123 and opening 124 in the metering spacer 12 and passage 48 in the throttle body and fuel bowl member 16 causing piston 126 under influence of spring 127 to lower push rod 128 and open valve 110.

Also, at idle speeds the accelerating pump lever 132 is positioned upwardly by throttle linkage. During acceleration as indicated by opening of the throttle 30 the piston 86 of the accelerating pump 38 is permitted to move down as shown in FIGURE 3 under the influence of spring 136 of actuating means 88 due to pivoting of lever 132 about pivot member 134. Downward movement of piston 86 causes fuel previously drawn into the chamber 138 lon upward movement of the piston 86 through check valve 108 to be fed to the engine past check valve 144 through passages 140 and 142, channel 143 in the air horn 14 and downward openings 146 in the metering spacer 12.

The choke valve 40 controls the position of the fast idle cam 36. Temperature compensation is provided by the bi-metal strip 148 in bi-metal housing 60 through linkage 56 while movement of the choke valve 40 due to engine manifold vacuum is accomplished by piston 44 in passage 42.

The drawings and the foregoing specification constitute a description of the improved carburetor in such full, clear, concise and exact terms as to enable any person skilled in the art to practice the invention, the scope of which is indicated bythe appended claims.

What we claim as our invention is:

1. A carburetor comprising a throttle body and fuel' bowl member including a fuel bowl portion and main air venturi passage, a metering spacer positioned over the throttle body and fuel bowl member including carburetor main fuel wells, a power valve and an accelerating pump depending therefrom and extending int-o said fuel bowl portion of the throttle body and fuel bowl member substantially centrally thereof, the main fuel wells including metering jets and said power valve and accelerating pump having fuel intake openings positioned centrally and adjacent the bottom of the fuel bowl portion of the throttle body and fuel bowl member, an air horn and fuel bowl cover member positioned over the metering spacer, an insulating gasket positioned between the air horn and fuel bowl cover member and the metering spacer and between the metering spacer and throttle body and fuel bowl member, means operable between the air horn and fuel bowl cover member and the metering spacer and between the metering spacer and the throttle body and fuel bowl member for aligning each of said members and means operable between the throttle body and fuel bowl member and the air horn and fuel bowl cover member for securing the air horn and fuel bowl cover member `and the `throttle body and fluel bowl together with the metering spacer and insulating gaskets clamped therebetween.

2. Structure as set forth in claim 1 wherein the metering spacer further includes a booster venturi positioned within the main air venturi, a carburetor fuel bowl oat pivot pin bearing mount, a choke temperature compensating bimetal strip housing and wherein the booster venturi, bearing mount, bi-metal strip housing, main fuel wells and portions of the power valve and accelerating pump are integrally constructed with the metering spacer.

References Cited by the Examiner UNITED STATES PATENTS Prentis 261-72 Bracke 261-72 Bracke 261-23 X Ball 261-34 Erickson 261-69 X Olson 261-34 X Olson 261-41 X Jorgensen et al 236-l01 X Sternaman 261-69 X Newman 261-34 Zub 261-34 Brown et al 261-39 X Szwargulski et al. 261-69 X Carlson et al. 261-72 X Romeo 261-72 Canada.

HARRY B. THORNTON, Primary Examiner. 

1. A CARBURETOR COMPRISING A THROTTLE BODY AND FUEL BOWL MEMBER INCLUDING A FUEL BOWL PORTION AND MAIN AIR VENTURI PASSAGE, A METERING SPACER POSITIONED OVER THE THROTTLE BODY AND FUEL BOWL MEMBER INCLUDING CARBURETOR MAIN FUEL WELLS, A POWER VALVE AND AN ACCELERATING PUMP DEPENDING THEREFROM AND EXTENDING INTO SAID FUEL BOWL PORTION OF THE THROTTLE BODY AND FUEL BOWL MEMBER SUBSTANTIALLY CENTRALLY THEREOF, THE MAIN FUEL WELLS INCLUDING METERING JETS AND SAID POWER VALVE AND ACCELERATING PUMP HAVING FUEL INTAKE OPENINGS POSITIONED CENTRALLY AND ADJACENT THE BOTTOM OF THE FUEL BOWL PORTION OF THE THROTTLE BODY AND FUEL BOWL MEMBER, AN AIR HORN AND FUEL BOWL COVER MEMBER POSITIONED OVER THE METERING SPACER, AN INSULATING GASKET POSITIONED BETWEEN THE AIR HORN AND FUEL BOWL COVER MEMBER AND THE METERING SPACER AND BETWEEN THE METERING SPACR AND THROTTLE BODY AND FUEL BOWL MEMBER, MEANS OPERABLE BETWEEN THE AIR HORN AND FUEL BOWL COVER MEMBER AND THE METERING SPACER AND BETWEEN THE METERING SPACER AND THE THROTTLE BODY AND FUEL BOWL MEMBER FOR ALIGNING EACH OF SAID MEMBERS AND MEANS OPERABLE BETWEEN THE THROTTLE BODY AND FUEL BOWL MEMBER AND THE AIR HORN AND FUEL BOWL COVER MEMBER FOR SECURING THE AIR HORN AND FUEL BOWL COVER MEMBER AND THE THROTTLE BODY AND FUEL BOWL TOGETHER WITH THE METERING SPACER AND INSULATING GASKETS CLAMPED THEREBETWEEN. 